/*******************************************************************************
 * Copyright 2014 Giovanni Paolo Gibilisco
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package it.polimi.modaclouds.space4cloud.db;

import java.sql.SQLException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class DataHandlerFactory {

	private static DataHandler instance = null;;

	private static final Logger logger = LoggerFactory.getLogger(DataHandlerFactory.class);

	public static DataHandler getHandler() throws DatabaseConnectionFailureExteption{
		if (instance == null) {
			try {
				instance = new DataHandler();
			} catch (SQLException e) {
				logger.error("Error building the data handler");				
				throw new DatabaseConnectionFailureExteption("Error building the data handler", e);
			}
		}
		return instance;
	}

	
	public static void resetHandler(){
		instance = null;
	}
	
	// hides the public constructor
	private DataHandlerFactory() {

	}

}
